In Call of the wild, How does Buck change from the beginning to the middle of the text?
A. He goes from a life of luxury to being a dog that is treated very cruelly.
B. He goes from a cruel situation to a very comfortable life as a pet.
C. He goes from being a sickly animal to being a strong sled dog.
D. He goes from being a sled dog to being a wild animal in the woods.